hi sergio, not necessarily. you can certainly provide a device with a seed timestamp that will carry through an app's runtime. there's also ntp for folks who run an ip stack on top of their radio.
-steve On 02/24/2012 09:37 AM, Sergio Campamá wrote: > You would need a Real Time module and implement some sort of syncronization > algorithm it yourself. There is no way for the microcontroller to guess the > current time of day. > > On Fri, Feb 24, 2012 at 10:50 AM, Zhonghua<zhong...@sics.se> wrote: > >> Hi all, >> >> I want to get a time which resolution should be microsecond on Tmote Sky. >> In my host computer and another platform E100 USRP I can use the function >> of gettimeofday(). But through mspgcc-4.5.3, the gettimeofday() is not >> accepted. Even after I added the time.h from my host computer's include/sys >> directory into /usr/local/msp430/include/sys/**, it shows "undefined >> reference to 'gettimeofday'. I checked the new added time.h, it uses an >> external function definition, which means it will rely on an external >> function do implement the practical function. But it seems this real >> external function is not existing in mspgcc. I wrote the function as >> http://svn.cod3r.com/a52codec/**trunk/liba52/src/gettimeofday.**c<http://svn.cod3r.com/a52codec/trunk/liba52/src/gettimeofday.c>directly, >> but the ftime() function in the invoked timeb.h is still an >> external function. I guess maybe I haven't install some necessary lib. I >> checked I have no gnulib, I don't know does it matter? >> I have spent too much time on that. Does anybody know how to get a >> relatively precise resolution time on Tmote Sky? Thanks in advance! >> >> Sincerely, >> >> Zhonghua >> >> >> ------------------------------------------------------------------------------ >> Virtualization& Cloud Management Using Capacity Planning >> Cloud computing makes use of virtualization - but cloud computing >> also focuses on allowing computing to be delivered as a service. >> http://www.accelacomm.com/jaw/sfnl/114/51521223/ >> _______________________________________________ >> Mspgcc-users mailing list >> Mspgcc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/mspgcc-users >> >> > > > > > ------------------------------------------------------------------------------ > Virtualization& Cloud Management Using Capacity Planning > Cloud computing makes use of virtualization - but cloud computing > also focuses on allowing computing to be delivered as a service. > http://www.accelacomm.com/jaw/sfnl/114/51521223/ > > > > _______________________________________________ > Mspgcc-users mailing list > Mspgcc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mspgcc-users ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Mspgcc-users mailing list Mspgcc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mspgcc-users
